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https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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6263203ed6
Add the concept of a gang to spufs as a new type of object. So far, this has no impact whatsover on scheduling, but makes it possible to add that later. A new type of object in spufs is now a spu_gang. It is created with the spu_create system call with the flags argument set to SPU_CREATE_GANG (0x2). Inside of a spu_gang, it is then possible to create spu_context objects, which until now was only possible at the root of spufs. There is a new member in struct spu_context pointing to the spu_gang it belongs to, if any. The spu_gang maintains a list of spu_context structures that are its children. This information can then be used in the scheduler in the future. There is still a bug that needs to be resolved in this basic infrastructure regarding the order in which objects are removed. When the spu_gang file descriptor is closed before the spu_context descriptors, we leak the dentry and inode for the gang. Any ideas how to cleanly solve this are appreciated. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* SPU file system
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*
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* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
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*
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* Author: Arnd Bergmann <arndb@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/list.h>
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#include <linux/slab.h>
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#include "spufs.h"
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struct spu_gang *alloc_spu_gang(void)
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{
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struct spu_gang *gang;
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gang = kzalloc(sizeof *gang, GFP_KERNEL);
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if (!gang)
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goto out;
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kref_init(&gang->kref);
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mutex_init(&gang->mutex);
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INIT_LIST_HEAD(&gang->list);
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out:
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return gang;
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}
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static void destroy_spu_gang(struct kref *kref)
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{
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struct spu_gang *gang;
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gang = container_of(kref, struct spu_gang, kref);
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WARN_ON(gang->contexts || !list_empty(&gang->list));
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kfree(gang);
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}
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struct spu_gang *get_spu_gang(struct spu_gang *gang)
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{
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kref_get(&gang->kref);
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return gang;
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}
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int put_spu_gang(struct spu_gang *gang)
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{
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return kref_put(&gang->kref, &destroy_spu_gang);
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}
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void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
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{
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mutex_lock(&gang->mutex);
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ctx->gang = get_spu_gang(gang);
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list_add(&ctx->gang_list, &gang->list);
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gang->contexts++;
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mutex_unlock(&gang->mutex);
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}
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void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
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{
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mutex_lock(&gang->mutex);
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WARN_ON(ctx->gang != gang);
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list_del_init(&ctx->gang_list);
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gang->contexts--;
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mutex_unlock(&gang->mutex);
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put_spu_gang(gang);
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}
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